Corrected entry: As the spacecraft disappears behind the moon you can hear Swigert (Kevin Bacon) saying "see you on the flip side" and a shadow begins to fall across his face. Assuming the spacecraft's attitude wasn't changing at the time, the only way a shadow (presumably of the moon) would have fallen like this would have been if the moon's phase was full or close to full, as seen from earth. The lunar landings were planned for times when the sun was low in the lunar sky, to avoid intense surface heat, thus the moon was usually a crescent as seen from earth.
Corrected entry: When Mattingly is getting ready in the simulator to try re-entry power-up procedures, he asks someone for a flashlight. The person who tries to hand him one starts grabbing for his flashlight before Mattingly asks for it. (01:18:35)
Corrected entry: when Marilyn is watching Jim talk about flying with no light in the cockpit, the carpet changes from green shag, to orange shag, and back again.
Corrected entry: During the TV broadcast, Gene Kranz confirms with the EECOM that the cryo stir will be on both hydrogen and both oxygen tanks. But when the astronauts get the instructions for the stir, it is just on the oxygen tanks. What happened to the hydrogen tanks?
Corrected entry: When the three astronauts travel around the moon, the radio contact breaks down. During this radio silence, they spot their planned landing site, Fra Mauro, on the surface of the moon. Just after this sight, Houston can get in contact with them again. So, only then, the spaceship comes out from behind the moon. But Fra Mauro is on the visible side on the moon, almost in the middle of it. How could the astronauts see Fra Mauro while they were still on the back side of the moon?
Corrected entry: During the launch scene, there is a shot where the plume of flame is going backwards, as if it is going back into the rocket.
Corrected entry: When the astronauts have rounded the moon there is a scene where Houston is helping them to make a blind LM burn, we see Hanks and Paxton at the controls of the LM and Bacon timing them. Well Hanks and Paxton are standing velcro'd to the floor looking out the two large triangular LM windows at a distant earth. Hanks lines up the optical lunar distance rangefinder on the Earths terminator and they fire the engine merrily rocketing off towards the Earth. This is in error, the LM engine is under their feet pointing down and 90 degrees away from the imaginary line between the Moon and Earth. The astronauts should be looking out of the small rectangular docking hatch in the roof of the LM ABOVE their heads because that is where the Earth would be and certainly not out in front of them. Obviously the LM engine is not behind their backs when they fired it but under their feet pointing down so the Earth is opposite the engine and thus above their heads, not in front of them in the nice big movie friendly windows.
Corrected entry: After the spacecraft has lifted off and is in space, Houston tells the crew to shut down the engines. Just as Hanks says, "that, gentlemen, is how we do that," we see the engine turning off. A couple of scenes later, when we see the spacecraft heading towards the moon (with the moon in the backround), you can see a flame coming out of the engine and once again it shuts down, when it was already turned off.
Corrected entry: At the part where they launch the Saturn 5 rocket the arms go the same direction. The arms are supposed to go one on the left, one on the right and so on. That is because the tower has to be balanced.
Corrected entry: As the Apollo 13 crew is readying to "slingshot" around the back of the moon, burn calculations are being made by Houston which are relayed to the crew. Tom Hanks is calculating total fuel amounts in the various fuel tanks by mathematical addition using a slide rule. You don't add and subtract with a slide rule. You multiply and divide.
Corrected entry: After their slingshot around the back of the moon, the movie's tenseness calms as Tom Hanks turns his head to look out one of the module's windows at the moon, and then turns his head to the other adjacent window to look at a serene view of the earth. The tenseness shouldn't have calmed. If the moon is on one side of you and the earth is on the other ... you're going the wrong way.
Corrected entry: On their way towards decent to Earth, there was a point made about them not being heavy enough, due to not returning "moon rocks". At this point they still have the base of the LEM attached, which is normally left on the moon. I don't know how much this weighs, but wouldn't this counteract any weight issues?
Corrected entry: When Lovell is talking to his wife on Earth about the moon she asks him where is her mountain (Mt Marilyn) He shows her it is near the top right of the moon's face. When he is behind the moon Bill Paxton mentions "There is Mt Marilyn" Then "Look at that Tsiolkovsky crater" Tsiolkovsky is on the far side of the moon so couldn't be anywhere near Mt Marilyn.
Corrected entry: In the scene just before everyone at the Lovell's residence watches the moon landing on television, Pete Conrad explains how he appreciates everyone coming to his dress rehearsal party for his Apollo 12 landing. In the shot just before he says this you can see Jim Lovell with a cigar in his mouth, but as the shot changes from a wide angle to Pete Conrad speaking you can hear Jim Lovell saying "Oh, sit down Conrad!" How can he be speaking so or at all with a large cigar in his mouth? (00:03:30)